Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 29, 2021	Oct. 30, 2020	Jul. 31, 2020	May 01, 2020	Jan. 31, 2020	Nov. 01, 2019	Aug. 02, 2019	May 03, 2019	Jan. 29, 2021	Jan. 31, 2020	Feb. 01, 2019
Net Income
Basic Earnings	$ 642,743	$ 574,260	$ 787,601	$ 650,446	$ 535,437	$ 365,550	$ 426,555	$ 385,013	$ 2,655,050	$ 1,712,555	$ 1,589,472
Diluted Earnings									$ 2,655,050	$ 1,712,555	$ 1,589,472
Shares
Shares outstanding, basic									248,171	256,553	265,155
Effect of dilutive share-based awards									1,905	1,500	950
Shares outstanding, diluted									250,076	258,053	266,105
Per Share Amount
Basic earnings per share (in dollars per share)	$ 2.64	$ 2.32	$ 3.15	$ 2.58	$ 2.11	$ 1.43	$ 1.65	$ 1.49	$ 10.70	$ 6.68	$ 5.99
Diluted earnings per share (in dollars per share)	$ 2.62	$ 2.31	$ 3.12	$ 2.56	$ 2.10	$ 1.42	$ 1.65	$ 1.48	$ 10.62	$ 6.64	$ 5.97
Share-based awards outstanding excluded from computation of diluted earnings per share									200	300	800